Mybatis 批量更新实体对象方式

    /**
     * 根据更新采购计划（批量）
     * @param plans
     */
    void batchUpdatePlan(List<PubPurchasePlan> plans);

<sql id="batchUpdatePlanCondition">
    <where>
        <foreach collection="list" item="item" open="( " separator=") or (" close=" )">
            comId = #{item.comId} AND id = #{item.id}
        </foreach>
    </where>
</sql>
<update id="batchUpdatePlan" parameterType="list">
        UPDATE pub_purchase_plan
        <trim prefix="set" suffixOverrides=",">
            <trim prefix="warehouseId=case" suffix="end,">
                 <foreach collection="list" item="item" index="index">
                    WHEN comId = #{item.comId} AND id = #{item.id} THEN #{item.warehouseId}
                 </foreach>
            </trim>
            <trim prefix="productId=case" suffix="end,">
                 <foreach collection="list" item="item" index="index">
                   WHEN comId = #{item.comId} AND id = #{item.id} THEN #{item.productId}
                 </foreach>
            </trim>
            <trim prefix="amount=case" suffix="end,">
                 <foreach collection="list" item="item" index="index">
                   WHEN comId = #{item.comId} AND id = #{item.id} THEN #{item.amount}
                 </foreach>
            </trim>
            <trim prefix="deleted=case" suffix="end,">
                 <foreach collection="list" item="item" index="index">
                   WHEN comId = #{item.comId} AND id = #{item.id} THEN #{item.deleted}
                 </foreach>
            </trim>
            <trim prefix="price=case" suffix="end,">
                 <foreach collection="list" item="item" index="index">
                   WHEN comId = #{item.comId} AND id = #{item.id} THEN #{item.price}
                 </foreach>
            </trim>
            <trim prefix="type=case" suffix="end,">
                 <foreach collection="list" item="item" index="index">
                   WHEN comId = #{item.comId} AND id = #{item.id} THEN #{item.type}
                 </foreach>
            </trim>
        </trim>
        <include refid="batchUpdatePlanCondition"/>
</update>
 

 
    <!-- 批量更新第一种方法，通过接收传进来的参数list进行循环着组装sql -->
     <update id="updateBatch" parameterType="java.util.List" >
        <foreach collection="list" item="item" index="index" open="" close="" separator=";">
            update standard_relation
            <set >
                <if test="item.standardFromUuid != null" >
                    standard_from_uuid = #{item.standardFromUuid,jdbcType=VARCHAR},
                </if>
                <if test="item.standardToUuid != null" >
                    standard_to_uuid = #{item.standardToUuid,jdbcType=VARCHAR},
                </if>
                <if test="item.gmtModified != null" >
                    gmt_modified = #{item.gmtModified,jdbcType=TIMESTAMP},
                </if>
            </set>
            where id = #{item.id,jdbcType=BIGINT}
        </foreach>
    </update>
 
    <!-- 批量更新第二种方法，通过 case when语句变相的进行批量更新 -->
    <update id="updateBatch" parameterType="java.util.List" >
        update standard_relation
        <trim prefix="set" suffixOverrides=",">
            <trim prefix="standard_from_uuid =case" suffix="end,">
                <foreach collection="list" item="i" index="index">
                    <if test="i.standardFromUuid!=null">
                        when id=#{i.id} then #{i.standardFromUuid}
                    </if>
                </foreach>
            </trim>
            <trim prefix="standard_to_uuid =case" suffix="end,">
                <foreach collection="list" item="i" index="index">
                    <if test="i.standardToUuid!=null">
                        when id=#{i.id} then #{i.standardToUuid}
                    </if>
                </foreach>
            </trim>
            <trim prefix="gmt_modified =case" suffix="end,">
                <foreach collection="list" item="i" index="index">
                    <if test="i.gmtModified!=null">
                        when id=#{i.id} then #{i.gmtModified}
                    </if>
                </foreach>
            </trim>
        </trim>
        where
        <foreach collection="list" separator="or" item="i" index="index" >
            id=#{i.id}
        </foreach>
    </update>
批量更新第三种方法，用ON DUPLICATE KEY UPDATE
 <insert id="updateBatch" parameterType="java.util.List">
        insert into standard_relation(id,relation_type, standard_from_uuid,
        standard_to_uuid, relation_score, stat,
        last_process_id, is_deleted, gmt_created,
        gmt_modified,relation_desc)VALUES
        <foreach collection="list" item="item" index="index" separator=",">
            (#{item.id,jdbcType=BIGINT},#{item.relationType,jdbcType=VARCHAR}, #{item.standardFromUuid,jdbcType=VARCHAR},
            #{item.standardToUuid,jdbcType=VARCHAR}, #{item.relationScore,jdbcType=DECIMAL}, #{item.stat,jdbcType=TINYINT},
            #{item.lastProcessId,jdbcType=BIGINT}, #{item.isDeleted,jdbcType=TINYINT}, #{item.gmtCreated,jdbcType=TIMESTAMP},
            #{item.gmtModified,jdbcType=TIMESTAMP},#{item.relationDesc,jdbcType=VARCHAR})
        </foreach>
        ON DUPLICATE KEY UPDATE
        id=VALUES(id),relation_type = VALUES(relation_type),standard_from_uuid = VALUES(standard_from_uuid),standard_to_uuid = VALUES(standard_to_uuid),
        relation_score = VALUES(relation_score),stat = VALUES(stat),last_process_id = VALUES(last_process_id),
        is_deleted = VALUES(is_deleted),gmt_created = VALUES(gmt_created),
        gmt_modified = VALUES(gmt_modified),relation_desc = VALUES(relation_desc)
    </insert>

 @Override
    public void updateStandardRelations() {
        List<StandardRelation> list=standardRelationMapper.selectByStandardUuid("xiemingjieupdate");
        for(StandardRelation tmp:list){
            tmp.setStandardFromUuid(tmp.getStandardFromUuid()+"update");
            tmp.setStandardToUuid(tmp.getStandardToUuid()+"update");
        }
        long begin=System.currentTimeMillis();
        standardRelationManager.updateBatch(list);
        long end=System.currentTimeMillis();
        System.out.print("当前的批量更新的方法用时"+(end-begin)+"ms");
    }